How to preserve text selection when opening a jQuery dialog

问题

Using jQuery's dialog I came across the following quirk (tested in FF3):

User selects text
In code, open up a jQuery dialog
BUG: the text gets unselected

(text could be in a textarea or just an HTML on the page)

So, to me it seems like a funny (and annoying) bug or a quirk, but maybe there's a good explanation for that. And what interests me most, is how to preserve this text selection after opening the dialog?

Here's some code:

function getSelectedText() {
 var t;
 if (d.getSelection) t = d.getSelection();
 else if(d.selection) t = d.selection.createRange();
 if (t.text != undefined) t = t.text;
 if (!t || t=='') {
  var a = d.getElementsByTagName('textarea');
  for (var i = 0; i < a.length; ++i) {
   if (a[i].selectionStart != undefined && a[i].selectionStart != a[i].selectionEnd) {
    t = a[i].value.substring(a[i].selectionStart, a[i].selectionEnd);
    break;
   }   
  }   
 }   
 return t;
}

 $("#dialog").dialog({
    autoOpen: false,
    bgiframe: false,
    height: 60,
    width: 80,
    modal: false,
    show: 'highlight',
    title: 'wc'});
 alert(getSelectedText()); // Text is here      
 $("#dialog").dialog("open");
 alert(getSelectedText()); // Text is not selected here :( damn!

Thanks!

回答1:

The jQuery dialog will take the user's focus ( you should see one of the buttons selected on the dialog ). Browsers only have 1 focus so you lose whatever they had selected.

You should just retrieve the start and end positions of the user's selection before you do the dialog, and then reselected it after the dialog goes away.

I don't have any example code for getting and setting user's selection, but a web search should find you some.

Something like :

$("dialog").focus(function() {
  // save the selection
}).blur(function() {
  // set the text selection
});

[edited (Nickolay): see Keep text selection when focus changes for more code]

来源：https://stackoverflow.com/questions/824833/how-to-preserve-text-selection-when-opening-a-jquery-dialog

标签

javascript

jquery

html

selection